APNG

Support for animated PNG images in Google Chrome browser.
About APNG format: http://en.wikipedia.org/wiki/APNG
This extension animates IMG elements. Also it animates background images/list style images from INLINE css styles (div style="…"), but CSS images support may be incomplete..
You can prevent this extension from work on specific domains (Black List mode, default) or allowed it to work ONLY on specific domains (White List mode).
Source code is available on GitHub: https://github.com/davidmz/apng-chrome
WARNING! CAPTCHA may not work on some sites because of this expansion (it is not always possible to correctly detect captcha images). If captcha does not work on some site, just (temporarily) disable the extension on the it.
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Latest notable changes:
2.1.4 (2014-11-28) Fixed some incorrect captcha images
2.1.2 (2014-01-15) Better Reddit support.
2.1.0 (2014-01-12) Partial Reddit emotes support.
2.0.7 (2014-01-12) Redirects support.
2.0.4 (2013-05-26) Ext. was broken becouse of bug 238071 in Chrome 27. Fixed it.
2.0.3 (2013-03-19) Fixed bug with images with 'auto' height/width in style.
2.0.0 (2012-10-01) Most of the code rewritten. CSS background/list animations is turned off (except inline styles). Fixed slow work in some sites (g+, gmail and so on).
0.7.1 (2012-04-07) animated-gif-captcha images support (strange captchas of wedge.org)
0.7.0 (2011-08-03) fix for facepunch.com (perhaps the only site where this extension is actually used:))
0.6.9 (2011-07-14) data: url support, fixes for google maps images
0.6.8 (2011-07-09) fixed bug with CAPTCHA images
0.6.7 (2011-07-03) support for list-style-images
0.6.6 (2011-06-30) tracking changes in image's 'src'
0.6.2 (2011-06-30) background-image animation for internal and external CSS